Manufacture of cardboard containers



March 31, 1931. E. E. DENLER MANUFACTURE OF CARDBOARD CONTAINERS Filed Dec. 13, 1929 Patented Mar. 31, 1931 UNITED STATES PATENT OFF! EDWARD E. DENLER, or MEXICO CITY, MEXICO MANUFACTURE OF CARDBOARD CONTAINERS Application filed December 13, 1929, Serial No. 413,869, and in Mexieo January 15, 1929.

The present invention relates to improvements in the manufacture of card board containers, and more especially of those used for face powder. in which the powder is kept in a separate box placed inside of the container and closed on top with a paper cover to be torn before extracting the powder.

The invention has for its object to provide an improved method for manufacturing these inner boxes, by reducing the number of the different steps of operation. Another object of the invention is to facilitate the introduction of said inner box into the container, while producing a close fit, by reducing the diameter of the lower edge of said box by means of a suitably shaped die.

The invention is illustrated in the accompanying drawings in which:

Figure 1 is a side view, partly in section,

of the complete container for face powder.

Figure 2 is a side view, also partly in section, of the inner box containing the powder. Figure 3 illustrates the manner in which the paper cover and the lining of the inner box are jointly applied.

Figure 4 shows the card board or paper strip used for lining the box.

Figure 5 shows the paper disc forming the cover.

Figure 6 represents the lining of a box as actually manufactured, formed by a strip of card board having been wound around a mandrel.

Figure 7 shows the ring formed as shown in Figure 6, with the paper cover glued to one of its edges.

of part 1, said paper cover being torn for extracting the powder. 3

The improvements forming the object of the present invention refer'exclusively to the" manufacture of the inner box 2. As actually manufactured, this box consists of a rolled up paper or card board strip forming the'body of the box, with the inside lining formed by another rolled up paper strip 5 (Figure 6), to one of the edges of which is glued the paper cover 6, as shown in Figure 7. Y Obviously, the introduction of the lining 5 is rather difficult if a tight fit is to be obtained, which however is necessary forspre ading evenly the glue which holds the two parts together. It happens therefore frequently that the paper cover is torn While trying to introduce the lining. I i

According to'the invention, the paper cover 3 and the inner lining of box 2 are applied in one operation. The box 2, which provisionally only consists of a ring of rolled up card board, with oneof itsedges 2 curled inwardly in a manner already ,well lniown, is placed within the circular opening of a plate 7 and rests with its curled edge on another lower plate 8. On top of said ring 2, in a recessed portion of plate 7, is placed a 2 paper disc 3 having a larger diameter than the ring, the recess insaid plateserving to center said disc. Around a plunger 9, raised above said ring 2, is rolled a paper or card board strip 10, of a length substantially equal to the inner periphery of ring 2, a small quantity of glue having first been applied to the inside of said ring. v

The plunger 9. is then forced downward and pushes the'paper ,disc' 3 before it, until it comes to rest against theinwardly'curled edge 2 itsturned up flange adhering" to the inside of the ring 2 by the glue it has carried with it. The plunger 9, on its downward stroke, also pushes the strip 10 into the ring 2, thereby lining it, after which the plunger is withdrawn, leaving the lining glued to the ring,with the'flange of the paper cover placed between said ring and the lining.

The box being thus assembled, is placed again into a hollow plunger 11, with the paper cover 3 up, and is pressed with its lower use free edge against a reducing die formed by a plate 12 having a circular groove 13 with a sloping outer wall. By the pressure against this die, said lower edge is compressed inwardly, thereby reducing its diameter so as to facilitate the introduction of the boX 2 into the containerl. ThelininglO is preferably a little sh orteritlran "the height of said box so as to permit its lower edge to be compressed as described.

While the aforesaidimprovements in'the manufacture of containers are shown and described as applied to round containers for face powder, it is understood that the same may alsobe carried out'in the manufacture of any other kind of containers.

lVhat I claim is 1.,Armcthod of securingiin one operation a paper eoverandan inside lining to the body portion of ;a box with an openbottom, which consists-in placing a disc .of paper concentritally over saidbox, applying glue to the in side ofssaidbox pushing said paper disc downby a plunger which carries-withit the lininginaterial, and compressing the edge of theboX OPPOSltGitO thepaper cover.

'2. The method of securing in one operation a paper cover and an inside lining to the'body portion of a box with an open bottom and with .one ofits edges curled inwardly, which consists/in placingthe box with-the curled edge. downward, applying glue to the inside of said'box, placing a paper disc concentrirally on; top of said boxywinding a strip: of lining .material of substantially the same length as-the inner periphery. of said box aroundiaplunger, pressing down said plungerso as topush before it the paper discand carizywit'h it tlielining, down .tothe curled edge of; the box, and reducing the diameter of the edge o f-thelbox opposite to thepaper coverby means of a separate reducing die.

3. :The method of securing inone operation a paper cover and an inside lining to the body-portion of a "box with an open bottom andflwithone of its edges curled:inwardly which consists in holding the box with the curled-edge. downward, applying glue to the inside of said box, placingha disc of paper of glarger 1 diameter than. the box 1 concentri cally over its upper edge, windinga strip of liningjmateri-al of substantially the same length as the innerperiphery-of said box around a plunger, pushing saidpaper discs and saidlininginto said box-by means of said plunger,placing the-box with the paper covenup sina hollow .plungen and compressing.- its edge opposite to the f paper; cover in a die formed by a groove with a slopingouter wall;

In testi'm ony whereof I afi lX my signature.

I I 'EDVVARD. E.;DENLER 

